Looking more closely at the sign we saw being repainted in March 2010, the removal of the "Pool Closed..." line was not the only change.
Wally's pic:
"Health Code Regulation 100F - 103F / 38C - 40C"

Our pic:
"Health Code Regulation 100F - 113F / 38C - 40C"

113 degrees Fahrenheit is pretty darn hot (and 40C would equate to 104F, which is consistent with other Health Regulations I've seen) so I guess Wally's had the correct temp. at least.
The "zero" in Wally's 103F actually looks more like the letter "o", so maybe they've had to make this correction before.